An Inorganic-Rich Sei Layer by the Catalyzed Reduction of Lino3 with Surface-Abundant Hydrogen Bonding for Stable Lithium Metal Batteries

Tuning the FEC‐Related Electrolyte Solvation Structures in Ether Solvents Enables High‐Performance Lithium Metal Anode

“…There is more ROCO 2 Li/Li 2 CO 3 in 1 m LiTFSI-DOL/FEC compared with other 1 m LiTFSIglyme/FEC electrolytes. It is in agreement with the large ratio of LiF/CF x in the F 1s spectrum (Figure 6e), [73,74] which arises from the preferential decomposition of FEC in the first solvation sheath for 1 m LiTFSI-DOL/FEC. [75,76] Apart from LiF, the simultaneously generated carbonaceous compounds (Li 2 CO 3 , ROCO 2 Li, etc.)…”

“…[ 28,29,71 ] However, the moderated carbonaceous compounds and LiF were detected in the 1 m LiTFSI‐glyme/FEC electrolytes (Figure 6b–d,f–h), mainly derived from the reduction of free FEC in their Li + ‐solvation. [ 74 ] In addition, the ratio of LiF/CF x in 1 m LiTFSI‐G 2 /FEC and 1 m LiTFSI‐G 3 /FEC is larger than 1 m LiTFSI‐DME/FEC, which is one of the reasons for the better electrochemical performance of cells, suggesting the advantage of more free‐FEC molecules in the solvation sheath. Another stark difference in the SEI composition between these four electrolytes is depicted in S 2p spectra (Figure 6i–l).…”

“…In sharp contrast, there are additional characteristic peaks of inorganic Li 2 S observed in the 1 m LiTFSI-glyme/FEC electrolyte, derived from the deep decomposition of TFSI − . [74,79] The Li 2 S in the SEI layer is conductive for the ionic transport because of its high ionic conductivity and higher stability than inorganic Li 2 CO 3 , [71,80,81] which indicates the advantage of SEI in 1 m LiTFSI-glyme/FEC due to the free FEC in solvation structure.…”

Synergetic impact of nitrate-based additives for enhanced solid electrolyte interphase performance

“…As a potential additive for structuring a well-functioning SEI, LiNO 3 has been seen to easily dissolve in ether-based electrolytes and stabilize Li metal anodes. [55][56][57] Such effectiveness seems to stem from the favorable Li-induced decomposition of LiNO 3 , which can facilitate the formation of a uniform inorganic SEI layer rich in lithium nitride (Li 3 N) and lithium oxynitrides (LiN y O z ). 58,59 But the low solubility of LiNO 3 in carbonate electrolytes has hindered its practical application in conventional LIBs.…”

Formulating compatible non-flammable electrolyte for lithium-ion batteries with ethoxy (pentafluoro) cyclotriphosphazene

“…5e exhibited there were N-containing species (LiN x O y and Li 3 N) formed, both were reported to enhance the stability of SEI. 26,27 Overall, these changes of SEI were also reflected in Fig. 5f, and it was evident to see there were more N and less P content.…”